Functional structural body and method for making functional structural body

Abstract

Provide is a functional structural body that can suppress aggregation of metal oxide nanoparticles and prevent functional loss of metal oxide nanoparticles, and thus exhibit a stable function over a long period of time. A functional structural body (1) includes: a skeletal body (10) of a porous structure composed of a zeolite-type compound; and at least one type of metal oxide nanoparticles (20) containing a perovskite-type oxide present in the skeletal body (10), the skeletal body (10) having channels (11) that connect with each other, and the metal oxide nanoparticles (20) being present at least in the channels (11) of the skeletal body (10).

What is claimed is: 
     
       1. A structural body, comprising:
 a skeletal body of a porous structure composed of a zeolite-type compound; and 
 at least one metal oxide nanoparticle containing a perovskite-type oxide present in the skeletal body, wherein 
 the zeolite-type compound is selected from the group consisting of zeolites, cation exchanged zeolites and silicalites, 
 a framework of the zeolite-type compound is selected from the group consisting of FAU type (Y type or X type), MTW type, MFI type (ZSM-5), FER type (ferrierite), LTA type (A type), MWW type (MCM-22), MOR type (mordenite), LTL type (L type), and BEA type (beta type), 
 the skeletal body has channels connecting with each other, 
 the metal oxide nanoparticle is present at least in the channels of the skeletal body, 
 the channels have any one of a one-dimensional pore, a two-dimensional pore, and a three-dimensional pore defined by a framework of the zeolite-type compound and an enlarged pore portion with a diameter greater than that of any of the one-dimensional pore, the two-dimensional pore, and the three-dimensional pore and not defined by the framework of the zeolite-type compound, and the enlarged pore portion is greater than or equal to a diameter of the metal oxide nanoparticle, 
 a particle size of the metal oxide nanoparticle is greater than an inner diameter of any one of the one-dimensional pore, the two-dimensional pore, and the three-dimensional pore defined by the framework of the zeolite-type compound, 
 the metal oxide nanoparticle is present at least in the enlarged pore portion, 
 and 
 the perovskite-type oxide is selected from the group consisting of LaBO 3  (B═Mn, Cr, Co, Fe, Al, Pd or Mg), BaZrO 3 , La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3  (LSGM), LaFe 0.57 Co 0.38 Pd 0.05 O 3 , Ba 0.8 La 0.2 Mn 0.2 O 3 . 
 
     
     
       2. The structural body according to  claim 1  wherein the enlarged pore portion makes a plurality of pores, which constitute any one of the one-dimensional pore, the two-dimensional pore, and the three-dimensional pore, connect with one another. 
     
     
       3. The structural body according to  claim 1 , wherein an average particle size of the metal oxide nanoparticle is greater than an average inner diameter of the channels and is less than or equal to the inner diameter of the enlarged pore portion. 
     
     
       4. The structural body according to  claim 1 , wherein
 the metal oxide nanoparticle is a catalytic substance. 
 
     
     
       5. The structural body according to  claim 1 , wherein a metal element (M) of the metal oxide nanoparticle is contained in an amount of 0.5 mass % to 2.5 mass % based on the structural body. 
     
     
       6. The structural body according to  claim 1 , wherein an average particle size of the metal oxide nanoparticle is from 0.1 nm to 50 nm. 
     
     
       7. The structural body according to  claim 1 , wherein a ratio of an average particle size of the metal oxide nanoparticle to an average inner diameter of the channels is from 0.06 to 500. 
     
     
       8. The structural body according to  claim 7 , wherein the ratio of the average particle size of the metal oxide nanoparticle to the average inner diameter of the channels is from 0.1 to 45. 
     
     
       9. The structural body according to  claim 8 , wherein the ratio of the average particle size of the metal oxide nanoparticle to the average inner diameter of the channels is from 1.7 to 4.5. 
     
     
       10. The structural body according to  claim 1 , wherein
 an average inner diameter of the channels is from 0.1 nm to 1.5 nm, and 
 the inner diameter of the enlarged pore portion is from 0.5 to 50 nm. 
 
     
     
       11. The structural body according to  claim 1 , further comprising at least one other metal oxide nanoparticle held on the outer surface of the skeletal body. 
     
     
       12. The structural body according to  claim 11 , wherein a content of the at least one metal oxide nanoparticle present in the skeletal body is greater than that of the at least one other metal oxide nanoparticle held on the outer surface of the skeletal body. 
     
     
       13. The structural body according to  claim 1 , wherein the zeolite-type compound comprises a plurality of pores less than 1 nm in diameter.